Screwed pipe joint and in fittings relating thereto



F. G. JONES March 5, 1935.

SCREWED PIPE JOINT AND IN FITTINGS RELATING THERETO Filed Feb. 20, 1932 ram/M ATTORNEY5 Patented Mar. 5,1935 1 993 372 UNITED STATES PATENT orFIcE- SCREWED PIPE JOINT AND IN FITTINGS RELATING THERETO Frederick George Jones, Bristol, England Application February 20, 1932, Serial No. 594,278 In Great Britain February 24, 1931 2 Claims. (Cl. 285-120) This invention relates to pipe joints and fit- Having reference to the accompanying drawtings as used in connection with installations of ing: steam, gas or hydraulic tubing jointed in screwed Fig. 1 is a double T fitting partly in-section. joints. Fig. 2 is an illustration of a valve provided 5 In ordinary practice it is usual to consider the with the improved seating joint and having a 5 joint as made secure in a number of the screw clear bore through the valve. threads within the sockets and other fittings and Figures 3 to 7 disclose various arrangements upon the tubes to be joined. of connecting screw threaded pipes, Figure 7 dis- To effect this it is not unusual to have the screw closing my preferred modification.

10 threads upon the pipe ends slightly tapered, and An important feature of the pipe fittings here- 10 the said threads are commonly fitted with yarn in described is the provision of a perfectly clear and red lead putty before being screwed into bore throughout a system of piping and joints of joint sockets and other fittings. any length, in curved members as in straight It is known that improved socket joints have lengths, and in the adoption of streamlines of been suggested wherein the pipes to be jointed minimum resistance in all fittings used for 15 are shaped and butted together within the sockbranching ofi from the main straight lines. ets using right and left hand screw threads and The seatings described enable a clear bore to such joints have been carefully noted. be maintained, as the passage through the fit- These joints, in which the pipes themselves are tings and pipe joints is simply a continuation of 2a butted, are used only on straight lines of piping, the pipe bore through the seatings, and thereby whereas the improved joints herein described are an unbroken fluid stream is permitted. applicable to all the joints in a system of piping. Fig. 1 shows a part section of a double T, or

The object of my invention may be regarded cross fitting in one piece which allows several generally as the provision of a definite seating diversions from the prime direction. The butt in all the fittings used in screwed pipe jointing. joints of the pipe ends are similarly made at 9 25 The said seatings are accurately machined and on the seatings 6 in all the sockets 3, and generthe ends of the pipes are similarly machined to ally any such fittings can be adapted for the a true face for butting closely upon the seatings. clear bore seating joints.

The fittings described may be of cast steel or of Fig. 2 is a detail of a plug valve in part secmalleable cast iron with the seatings integral tion showing the method of application of the 30 with the body of the said fittings, or in some cases improved jointing and clear bore to such fittings. the seating is made as a separate ring fitted by The plug 15 has a clear way 8 corresponding to screwing or otherwise into any socket or other the bore of the seating 6 and the bore of the pipes fitting in which it may conveniently be used. 1 and 1'.

The seating in any form of pipe fitting may be The threaded end 2 of the pipe 1 is faced and 35 cast as a complete diaphragm across the pasclosely butted at 9 on the seating 6 which is insage through the fitting and the diaphragm tegral with the valve. bored to the exact size of the interior diameter seatings eas t w s m d S0 d with of the pipes to be jointed. The bored seatings e Sockets in a y f the fittings may be sup become a part f the pipe line when the fa ed mented by the addition of separate rings of any 40 ends of the pipes are screwed firmly against the suitable 3 if e and of any thickness. said seatings Modificatlon of the pipes, fittings and seatings In fittings Such as T5, elbows and bends, the described are used when desired for any reason seatings are formed integral with the fittings, i i z g piping These and the seating is faced on one side only. Sepa- S gfg f' e r 11 th ded rate seating rings of soft metal may be used in e p p as n 1 e y rea socket 3 which is formed in one piece with the con unctmn with the integral seatings if desired. mpg The Seating 6 is faced as before described The faced seatings described are used also in and pipes or fittings are faced at 12 and butt the valve fittlngs on the pipe line as in the other closely at 9 upon the seating 50 fittings herein mentioned, 50 that the whole 0f Fig; 4 shows a traight double socketed pipe th j ts n the syst m an b r li d up und or fitting 1 of any suitable length. The sockets h gh pressures- Unusually Shaped fi t gs such 3 are internally threaded and have faced seatas S or U shaped bends are provided with the ings 6 to receive the pipe or fitting 1' faced at 56 improved seatings and butted joints. 12 to form the joint at 9.

' 8 or interior diameter of the pipes is maintained clear and unobstructed through all the joints and fittings by the use of bored and faced seatings and faced pipe ends.

Fig. 6 shows an alternative form of the joint with a variation in the faced seatings suitable for disconnecting a pipe from the pipe line. The socket 3, as before mentioned, is here in two parts 3, 3'. The faced seating 6 is entirely on the part 3 which is screwed upon the faced pipe 1, making the joint at 9. This part of the socket is threaded exteriorly at 15 to engage screw threads within an enlarged part 16 upon the half socket 3, which is formed hexagonally at 17 for use with a spanner. When the two parts are united to form the socket, the second faced pipe 1' is screwed into the part 3 to butt against the faced seating as shown at 9. Clearance is provided at 10, as before shown.

Fig. '7 is a similar joint with the two parts 3, 3 each provided with faced seating 6. The said parts are screwed upon the pipes 1, 1- making butt joints at 9 as before described. A third part 16 is threaded to engage the exterior screw 7 threads 15 on part 3. Annular dovetail recesses at 18, provide means for tightening the face joint 19 when the part 16 is screwed upon the threads at 15 of the part 3.

Having now particularly described and ascertained the nature of my said invention, and in what manner the same is to be performed, I declare that what I claim is:

1. A pipe coupling comprising two pipes of equal bore, each having its end threaded and its end face machined to form a perfectly flat surface, an interiorly threaded collar in threaded engagement with one of said pipes, said collar being exteriorly threaded and having at its outer end an inwardly directed annular flange,

the inner diameter of which is identical with the bore of the pipes and the inner end face of which is machined to coincide with and coact with the machined end of the pipe to form a fluid-tight joint and a second collar interiorly threaded and being of suflicient diameter at one of its ends' -pipes, said collar being exteriorly threaded and having an inwardly directed annular flange, the inner diameter of which is identical with the bore of the pipes and the end faces of which are machined to form flat seating surfaces, an interiorly threaded collar engaging the threaded end of the other pipe, the outer surface of said collar being smooth and the outer end ofsaid collar being provided with an outwardly directed flange and an inwardly directed flange, the inner diameter of which is identical with the bore of the pipesand the end faces of which are machined to form flat seating surfaces, the inner faces of each of said inwardly directed flanges being adapted to coact with the end faces of the respective pipes to form fluid-tight joints and the outer faces of said flanges being adapted to coact with each other to form a fluid-tight joint and a third collar having at one of its ends an inwardly directed flange, the inner diameter of which is sufficient to embrace the outer surface of the second mentioned collar and the other end of which is interiorly threaded to engage the exterior threads of the first mentioned collar.

FREDERICK GEORGE JONES. 

